Typewriting machine



Patented Mar. 1,, E924.

arrea snares [meant rat carton.

MANSFIELD C. CRAWLEY, OF GROTON, NEW YORK, ASSIGNORTO ADDOGRAPE'. COM

' PAN Y, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

Y rYrEwnrrme MACHINE Application filed August 29, 19 17, Seriallto. 188,771. Renewed April 16, 1923.

To-aZZ whom it may concern:

Be it known that I, MANSFIELD C. CRAW- am, a citizen of'the': United States, and a resident of Groton; '-in the county of Tompkins and State of New York, have invented certain new and useful Improvements, in l.ypewriting Machines, of which the following is a-specification.

This invention relates particularly i m* 1o provenients in means for vertlcally shifting the platen to provide for printing the sev oral case characters.

In the typewritlng machine shownin" release .of the key controlling said 'means,

Patent No. 1,156,061, dated October 12, 1915, the type bars are moved to printing position by means of an intermittently operatmg mo tor, preferably a spring, and the said intermittent motor is withdrawn or retracted by means of a. continuously operating motor, the connection between this latter motor and the motor for operating the type bars being (OllilOllQtl by suitable keysarrangedfl'i-n the A .vide a'key-controlled power-actuated caselcex board. The platen shifting mechanism described herein-is well adapted for use in that type of machine, but, of course, it is not restricted inits application and may be applied to any power-actuated typewriting machine having a suitable operating motor.

\ One of tlieprincipal objects of the inven- 6 tionis to provide a case shifting mechanism normally disconnected fromlthepower means and adapted to. be c'onnectedsaid power means: by keynontrollednie anis'm fora period of timesuflicient toeffect' the change of case irrespective of thetime of release of the key of said keycontrolled mechanism.

Another objectrof the invention is to provide power-actuated nieans for vertically shifting the platensliift frame or other caseshift support and fdr looking it in position for the upper case characters by the action of gravity, and to provide key-controlled means for releasing the platen from its upper case position..,, i

Another important object of the invention is to provide a continuouslyoperating shaft and key-controlled mechanism adapted to be connected to said shaftflfor moving the platen shift frame 'orfother ease-shift support to its upper case position, said means being then automatically disconnected from the shaft and the platen shift frame or other case-shift support locked in its raised POSlr- Another object of the invention is to prooriother case-shift support to its upper-case tion; and a further object of the invention is to provide an additional key-operated means for releasing the platen'shift frame or othercase-shift support from its upper case position and permitting it to move j downwardly to its normal or lower case positiorn, 0o

vide a continuously operating shaft and keycontrolled means adapted to be connected to saidshaft for shifting a platen shift frame 66 position'and locking it in said position after and to provide an additional key-controlled 70 dpwnwardly to its normitting it toniov'e 11 only upon release mallower-case Po {of the key controllin' said additional means followin a depression of said key.

A furt er object of the invention is to proshift mechanism wherein a shift-frame is locked in upper case position and is bothshifted to upper case position and released by power other than that applied by an operator.

There are other important objects and advantages of the invention, all of which will appear hereinafter, and it will 'of course be understood that this invention is not confined to that type of case-shift mechanism, in which the shift-frame or support carries the platen and is shifted relatively to the type-bars to change case, since it is adapted for use in the equivalent type of case-shift mechanism in which the shift-frame or support carries the type-bars and is shifted relatively to the platen to change case.

' In the drawings, Figure 1 is a vertical longitudinal sectional view of a portion of a typewriting machine, showing the invention applied thereto;

Fig. 2 a transverse vertical sectional View of the machine, showing the platen "shifting mechanism; I

Fig. 3 a view Similar to Fig. 1, showing the platen shifted to the upper-case position;

Fig. 4 adetail plan view of the dog which connects the'case shift means to the drive shaft; andi i "Fi a detail view showing-the position of'the parts ,at the completion of theicase' shift movement.

' ,claims to subject matter common to said patent and this application are made in said patent, the-present application being sub- 'Ihe case-shift mechanism herein shown and descr bed possesses certain features in comm on with the case-shift mechanism form'- 1 ing the subject. matter of my Patent No. 1,455,109,- dated May 15, 1923. The broad ordin'ate'to said patent wherein is shown' a "case-shift mechanism in which a case-shift mechanism embodying a 'shift and'lock-up dire'ctly'below the bar 5 of the platen shi-ft' frame, is mounted a transverse rock shaft support ismoved by power taken from a constantly running shaft, 'the case-shift control key andQa temporary shift control key which is operable also as a'release key for effecting restoration of the parts to normal after an operation of'the shift and lock up key. 1

Referringto the. various parts v by nunier- I als, 1 designates the drive shaft Which is continuously operated by means of a suitable motor (not shown)connect ed by a belt-or other suitable means tothe drive'pulley2 mountedv on saidshaft; Rigidly secured on 1 the shaft lis a worm 3.

tion of the typewriter frame is mounted, the platen 4, said" platen being suitalily sup-- ported fora vertical movement.

In the upper por;

Mounted in the .platen carriage andadapted to move transversely oflthe machine with the platen,

as the platen is moved for letter or word' spacing, isa track or bar 5, said .bar forming. a part of-a suitable shift frame in which the platen ismounted. It is to beunderstood that this shift framemay, be of any suitable c'oiistructionQ r In the lower part of the machine frame,

6, the ends'of said shaft being suitably .journaled in the frame of'the'maehine. The

v saidashaft 6 is formed, with a shortflerank. portion 7 on which isjournaled a vertically extending shift bar 8 in the upper end of which .is'mounted a l'oller 9 which at all tim esyenga'ges the under side of theshift' .bar In the normal position of the platen the crank portion? of shaft 6 extends downwardly so that the platen ismaintainedin position for printing lower-case character's. In order to lift. the, platen into itsuppercase position theshaft 6 is partially rotated. ()n the shaft 6 is rigidly secured a pinion 10, and meshing with'said pinion is,a segmental rack 11 mounted on the forwardend of a pivoted arm 1.2,said arm being adapted to,

be vertically reciprocated through poweractuated mecl'ianism put 1nto action by suitf I ably disposed keys, as will-be fully hereilr after described Mounted in the-machine frame altr ahsversely-extending rock shaft 13, the ends of downpositions.

. nonsmowhich" are joiirnaled in suitable bearings.

Rigidly secured to said shaft at each. end

"thereof is fa forwardly extending arm 14. A

spring 14* is connected to each 'of said arms and to the base of the machine, to return the machine and the shift lever 15 is arranged at the I'lglltfl'lllld side thereof. By depressing the finger key 16 of either one of sa-idshift levers, the cooperating arm 14 will be lifted andthe' shaft 13 rocked. Secured rigidlyto the'rock shaft 13 is a forwardly extending arm 13, the forward end of whichis connected to an upwardly extending dog-operating bar 17 whose upper end is adapted to engage a dog and to move it intoengagement with the worm on the operating shaft, all of which will 'more fully hereinafter appear.

Iivotally mounted upon a suitable support within the-machine frameis a bellcranklever 18, one arm of which extends upwardly and is pivotally conneeted'to a horizontal dog '19; the other arm of said lever ektending' ,substahtiall'y hprizohtally and being pivotally connected to a dependifing rack-operating link 20." The lower end of this link is formed with a slotEZl in which fits a pin 22 rigidly securdtothe 1LCl( 'aIIIi 12. In the normal position of ,the link 20 the pin 22 engages the upper wall of the slot 21, t'he said' slot extending downwardly from said pin, as shownclearly in Fig. 1', so thatuponmoving the link 20 downwardly the 21111112 and its rack 11 are 'corres 'vondingly moved. The, free end of the dog 19 is formed with an up;

war |l 'extending lug 23which is adapted" to be brought into engagement with the with a'laterally extending lug 24 which is adapted to be engaged by the notched upper end ofthe dog-operating bar 17, said bar being adapted to move the dog upwardly Directly below] the worm; is rigidly mounted agi1ideplate-25 formed with a stop 26 at its outer end. This "plate is 'p ."ovided with a slot 27 adjacent the stop 26, through which slot the lateral finger 28 of the dog 19 is adapted to pass.

worm 3. Thesaid dog 10 is also formed to bring the lug 23v into engagement with .the worm.

In the normal position of the dog 19 the finger 28 is ,in engagement with" the stop 26. Upon lifting the bar 17 the finger28 passes upwardly through the slot 27 and the lug 23; is brought into engagement with the worm 3.- The rotation ofthe worm-carriesthe d'og laterally toward the right, as

hook 36.

viewed in Fig. 2, the finger 28 riding over the guide plate 25 until it reaches the inner edge thereof, whereupon said finger drops from the plate and the dog is released from the worm. A spring 29 restores the bellcrank lever 18 to its normal position and at the same time returns the dog 19 to the position shown in Fig. 2, wherein the finger 28 is in engagement with the stop 26 and is directly below the slot 27. Spring 30 withdraws the dog from the worm 3 when the finger 28 is released from the plate 25, and lowers said dog sufiiciently to permit said finger to travel under the plate 25 until it reaches the stop 26. Suitable stop pins 31 and 32 are provided for r the bell-crank lever 18 and the dog 19, stop 32 being carried by'the said lever. The bar 17 may be suitably guided in its vertical movement, and a spring 17 holds it yieldingly in position to engage the dog 19.

When the dog 19 is moved toward the right through its engagement withthe worm 3 the-bell-crank lever is swung on its pivot and the link 20 is depressed or moved downwardly. Because of the connection between the link 20 and the pivoted rack arm 12 the said arm is moved. downwardly and the rack 11 rotates the shaft 6 over rearwardly because of its geared connection with the pinion 10. The rotation of the shaft 6 moves the crank 7 into its upper position thereby vertically shifting the bar 8 and lifting the platen into its upper case.

position. The shaft 6 is provided, near the left-hand end thereof, with a stop pin 33 which is adapted to engage a fixed pin 34 mounted in the machine frame. These two pins are arranged to engage each other when the shaft 6 has been givenslightly more than a one-half revolution over rearwardly, so that pin 33 will have moved slightly beyond the vertical center of the shaft when it is at rest against the pin 3-1, and the weight of the platen sustained through the bar 8 and roller 9 willhold said shaft locked in its partially rotated position. By this means the platen will be locked in its upper-case position.

Rigidly secured to the shaft 6 near the right-hand end thereof is a radial release pin 35. In the normal position of said shaft, when the platenis in positionfor printing lower-case characters, the release pin extends'rearwardly, asfshown in full lines in Fig. 1. When the shaft 6 is rotated over rearwardly to place the platen in its upper ease position the release pin is moved to the position indicated in Fig. 3,

the said pin in this position extending forwardly. Pivotally mounted on the shift lever 15 'is an upwardly extending-release The lower end of this hook is adapted; to abut squarely against a transverse release bar 37 when the shift lever stated-hereinbefore, engages the stop pin 34:

and the p aten is locked in its upper position. When it is desired to return the platen to its lower-caseposition shift lever 15 is operated. As the rear end of the said lever is lifted free of the release bar 37 they release hook 36 will be drawn rearwardly' by its spring into position toengage the end of the pin 35. Upon the release of the shift lever the springs 141: attached to the, arms 14: return the shift lever to its normal position thereby sufliciently rotating the shaft 6 over forwardly through the release pin 35 and hook 36 to carry the crank 7 back again be yond its dead center, whereby the weight of the platen will then complete the return of the shaft and the connected segment 11 to their normal positions. When the squared lower end of the release hook engages the release bar 37, said hook is thrown forwardly out of the path of the pin 35.

\Nhenit is desired to move the platen into however, it desired to hold the platen in its upper-case position merely temporarily while writing a capital letter or the like, the shift lever 15* at the right-hand sideof the machine is operated. It is to be understood that the release hook 36 is secured to the shift lever 15 and not to the shift lever 15.

The slot 21 in the link 20 is to permit the link 20 and bell-crank lever 18 to return to their normal positions with the platen locked in its upper-case position. It will, ofcourse, be understood that in this position the'rack 11 is in. its lower position, the slot 21 being necessary in order to permit the link 20.to

have an upward movement independently of the segment-carrying arm 12. I

From the foregoing it is manifest that the operation of either one of the shift levers Will move the dog 19 into engagement with the Worm 3 and that thereafter the poweremsan of the work of lifting the tim to its upper-case position, the key-operated means merely connecting the power or motor to the platenshifting means.

The mechanism interposed between the drive shaft'and the shiftable platen support constitutes a case shift mechanism by means of which the platen ismoved to its up or case position. When the platen is locke in its upper case position, that portion of the case shiftmechanism which is directly connected to the platen support, is also locked. That portion of the case shift mechanism :which is adapted to be directly engaged with the driveshaft is "released from the drive shaft. at the completion of the case shift movement, and automatically returns to its normal .position. The case shift mechanism, however, as a whole, remainsinoperative so long as the platen support and that portion of the case shift mechanism directly connected "thereto, is locked in the upper .caseposition; although there would be an idle move ment of a part of the case shift mechanism upon the operation of either one cfthe shift keys.

' v What I claim is:

. 1. In a'typewriting machine, a constantlyrotating power drlven shaft, a support movable to change case, mechanism for shifting said support and locking it in upper case.

position, means for connecting said supportshiftmg mechanism with said shaft, a pairof shift-controlling key levers each operable I shift movement. of the support effected by a without moving the other tov actuate said connectmg means, and means whereby the \supporbshifting mechanism will be returned to' normal position upon release of the key of 'oneonly of said levers, whereby.

thesupport'always Will remain in upper case position after depression and release ofthe' key of-ythe other lever and may return to normal position either after depression and release of the first key lever following an operation of said 'other lever or after release of the first key lever following'a casedepression of the key of said first key lever.

2. ty'pewriting machine comprising a constantly operating drive shaft, a caseshift-support, means adapted to be operated through said drive shaft for shifting the case-sl'iift-support to its upper case position,

key-actuated means for connecting said shift-111g aneans'to the drive shaft, and means for automatically disconnecting said shifting means from said shaft after the shifting action is completed. I 3. A typewrltmg machine comprising a support movable to change case,- power means for moving said supportto upper case position, a pair, of shift controlling keys, means whereby upon depression-of either key said power means will move the support to upper case position, means whereby said support Will be held in upper case position after release ofone of the keys and will returnto normal position only after release of the other key following a depres- 'sion of said other key to cause a case-shift operation or after release of said other key shift operation effected by the first key,

4. A typewriting machine comprising a support movable to" change case, power means for. moving said. support to upper case position, a pair-of shift cont-rolling keys, means whereby upon 'dcpressionbf either key said power means will move the support to upper case position-,means wherefollowing a depression thereof after. acase I by said support will be held'inupper case 7 position after release of 'one of the keys,

and means effective only on the upor release stroke of, the other key followinga depression thereof for returning the support-to normal case position. ,a V i '5. A typewriting machine comprising a 1 yconstantly operating drive-shaft, ,a' case shift mechanism adapted to be operated through said shaft, two shift keys each adapted to independently connect the casefshift' means to the. drive shaft, means tolo'ck the case shift mechanism in its upper c'asep'positiom: and means r'enderedeflective by depression ofone shift key to'release said lock and'-permit the case shift mechanism to returnfto its normal lpositiononly whenthe'slaid shift keyis released.

-' "6. A. typewriting machine comprising a constantly-operating drive shaft, caselshift mechanism adapted to be operated through said-shaftbut normally disconnected there-'- from, two shift keys one of saidkeys actuating means to'connect the case shift mechanism tothe drive shaft, means to automatiort-to' u )er case osition' a kc o eratively connected to put said poiver-driven means: into action, when depressed, and means .for effecting restorat on of the support tonornialincluding a springin which powerfor effecting said restoration is stored: by force applied by an operator to the keyin depressing the key, I i

8. In aitypewriting machine, the ,combination ofa constantly rotating shaft, a support shiftableto changecas'e, power-driven mechamsmfor shlfting said support to upper case position and holding it there, means for connecting said mechanism 'w vith the said means to connect said mechanism with shaftfapair of .shift keys for-actuating.

the shaft upon depression of either key,

c s rin tensioned b adepression of the last- P e y mentioned key andpetfective through said key and the means controlled thereby on said support-shifting mechanism to release the support and case position.

, 9. A typewriting machine comprising a Constantly operating drive shaft, a worm thereon, a platen, means adapted to beoperated through said worm for shifting the platen to its upper-case position, and key-actuated means for connecting said platen shifting means to said worm.

10. A- typewriting machine comprising a constantly operating drive shaft, a worm thereon, a platen, means adapted to be operated through said worm for shifting the platen to its uppercase position, key-actuated means for connecting said platen shifting'means to said worm, and means for automatically disconnecting the platen shifting' means from said worm.

ILA typewriting machine comprising a drive shaft, a worm thereon, a platen, a dog adapted to be moved bysaid worm, a key, key-actuated means for moving said dog into engagement with saidworm, and means adapted .to be operated,bysaid dog for shifting the platento its upper-case position.

12. A typewriting machine comprising a drive shaft, a worm thereon, a platen, a dog adapted to be moved by said worm, a key, key-actuated means for moving said dog into engagement with said worm, means adapted to be operated by said dog for shifting the platen to its upper-case position, and means for locking the platen in its upper-case position.

13. A typewriting machine comprising a drive shaft, a worm thereon, a platen, a dog adapted to be moved by said worm, a key, key-actuated means for moving said dog into engagement with said worm, means adapted to be operated by-said dog for shifting the platen to its upper-case position, means for locking the platen invits upper-case position, and keyactuated means for releasing the platen from its upper-case position. r p

14. A typewriting machine comprising a drive shaft, a worm thereon, a platen, a dog adapted to be moved by said worm, a key, key-actuated means for moving said dog in to engagement with said worm, means adapted to be operated by said dog for shifting the platen to its upper-case position, and means operatedby said key for releasing the platen from its upper-case position upon the release of said key.

15. A typewriting machine comprising a drive shaft, a worm thereon, a platen, a dog permit it to return to loweradapted to be moved by said worm, means adapted to be operated by said dog for shifting the platen to its upper-case position, two shift keys, means operated by said shift keys to move the dog into engagement with the worm to shift" the platen to its uppercase position, means to automatically lock the platen in said position, and means operated by one of said shift keys upon the release of said key to release the platen from its uppercase position.

16. A typewriting machine comprising a drive shaft, a. worm thereon, a platen, a dog adapted to be moved by said worm, a rock shaft, a pinion thereon, a segment rack engaging said pinion, means connecting said rack to said dog, means connecting the rock shaft to the platen to shift said platen to its upper-case position, and key-actuated means.

for moving the dog into engagement with the worm.

17. A typewriting machine comprising a drive shaft, a worm thereon,'a platen, a dog adapted to be moved by said worm, a rock shaft, a pinion thereon, a segment rack engagingsaid pinion, means connecting said rack to said dog, means connecting the rock shaft to the platen to shift said platen to its upper-ease position, key-actuated means for moving the dog into engagement with the worm, a release pin carried by said rock shaft, a key, a release hook carried by said key-and adapted to enga e the release pin when said key is depresse and means adapted to be engaged by said hook when said key is released to disengage said hook from the release pin. a

18. A typewriting machine comprising a drive shaft, a worm thereon, a platen, a dog adapted to be moved by said worm, a rock shaft, a pinion thereon, a segment rack engaging said pinion, means connecting said rack to said dog, means connecting the rock shaft to the platen to shift said platen to its upper-case position, keyactu ated means for moving the dog into engagement with the worm, a stop pin carried by said shaft, and a. rigid stop adapted to be engaged by said stop pin to lock the platen in its upper-case position.

r 19. In a case-shift mechanism, a shift frame, means for moving said shiftframe from lower case position to upper case posiconnected from said shift-frame-moving means, a pair. of keys, means operable by:

independent sources of power normally dis- "depression of either key to temporarily con,-

nect one of said'sources of power with said .'franie-nioving means to move the frame to upper case position, and means operable by only one of sa d keys to connect the other source of' power with theframe-moving means temporarily during upward move-' ment of said key to actuate the frame-mow mg means in the reverse dlrect on.

2-1. A. typewritm'gmachme comprising a interposed between the drive-shaft and the casershlft-sup 'iort for shifting said support,

-*a key, and means actuated. by said key to constantly-opera-ting during the entire shi'ftin connect said support-shifting mechanism to the drive shaft and maintain said connection operation regardless of the movements of the keyafter the shifting action isfbegun.

22'. A typewriting machine comprising a constantly-operating drive-shaft, a

support normally disconnected from T the drive-shaft, a key, and means actuated by the key to, engage and move a part of the with the'driveshaftand keep it in such engagement during the entire shifting opera- -t1on wlthout regard to subsequent move,

ments of the-key after the connection is es tablishe'd.

23'. A typewriting machine comprising a drive-shaft, a support shiftable to change shifting, the support normally disconnected from the drive-shaft, a key, means adapted to be actuated by said key-to engage the support-shifting mechanism and connect it to the drive-shaft,3and means to disconnect the support-shifting.mechanism from the drive-shaft at the completion of the caseshift movement.

24. A typewriting macliinecomprising a' 'supportshiftable to change case, mecha- "nism for shifting the support, a constantly} ,rotating drive-shaft, key-operated means drive shaft, a case shift mechanism nor-- a ama'lly disconnected from said shaft and adapted toheoperated through said shaft cas'eshift-support, mechanism for shifting said -mechanism andper'mit it to return'to its case, mechanism for.

of either ')f"saidshift keys to temporarily connect the'case shift mccl1anism,.to'tl1e drive shaft for a predetermined period irre- "spective of the length of time the key is held depressed, means to automatically lock position at the completion of the case shift movement, and means operated upon the release of one of the shift keys to release said lock and to permit thecaseShift mechanism 26-. A typewritin machine comprising a constantly operating drive shaft, a case shift mechanism normally disconnected from the drive shaft, two shift keys, means adapted the case shift mechanism in its'uppcr case v p to return toits normal lower caseposition; Q drive-shaft, a case-'slnft-support, mechan sm 'to be actuatedbyv each of said-shift keys to 5 set in motion case shift mechanism, means to automatically lock the case shift mecha- I nism in its upper case position, means to automatically disconnect the case shift mechanism from the drive shaft at the com- 9 pletion of the case shift movement, and means actuated by the, release 'of one of the case shift keys to unlock thev caseshift normal lowercase-position. V 27. A typewriting machine comprislngva drive -shaft,,a case shift mechanism no r mall-y disconnected from the said shaft,a

case shift key normally disconnected from the case shift mechanism, means adapted to be actuated by depression of said keyv to connect the case-shift mechanism to the drive shaft, -'for 'a fixedperiod of time, means to auton'iatically lock the caseshift mechanism I at the completion of the case shift movement, and means adapted to be operated upon the release of thecase shift key to unlock the case. shift mechanism and permit it to return to its normalpositlon,

thereon, a cas shift mechanism adapted to be operated through said worm, key-actu-p, ated means'for connecting said case shift 28. A typewriting machine comprising a no constantly. operating drive shaft, a worm .mechanism to said .Worm, and means for ated means for connecting said case shift mechanism to said worm, means for auto-- matically disconnecting the case mechanism from said worm upon the completion of the case shift movement and means or locking the case shift mechanism in its upper case position.

shift 30. A typewriting machinecomprising; a

drive shaft, a worm'thereon, a dog adapted to be'moved by said worm, a key, key-actuated means for movingsaid dog into engagement with said worm, and case shift mechanism adapted to be operated by said dog.

31. A typewriting machine comprising a constantly operating drive shaft, a platen,

.a case shift mechanism adapted to be op- 32. A typewriting machine comprising a constantly operating drive shaft, a platen, a case shift mechanism connected to said platen and adapted to beoperated th' ough said shaft, but normally disconnected therefrom, two shift keys normally disconnected from said case shift mechanism one of said keys, actuating means to connect the case shift mechanism to the drive shaft, means to automatically lock the platen in its upper case position, and means operated by the other shift key and effective only upon upward movement of said key to cause a return movement of the platen toits normal position.

33. In a typewriting machine, a support shiftable to change case, mechanism for shifting the support, a continuously-driven shaft, a control-key in the keyboard of the machine, means operable by said key for connecting the shifting mechanism to said shaft so as to thereby power-shift the support, and means for maintaining said connection until the shifting is completed regardless of the positioinor movements of a continuously-driven the control-key.

34. In a typewriting machine, a shiftable platen, mechanism for shifting the platen,

devices for connecting the shifting mecha msm to said shaft so as to thereby powershift the platen, and means for maintaining said connection until the shifting is com-' pleted regardless of the position or movements of the shift-key, means being provided in the shifting mechanism for locking the same when the shifting action is completed. and means also being provided for automatically disengaging the shifting mechanism from the powerdriven shaft when the shifting action is completed.

In a typewriting machine, powerdriven means for case-shifting embodying a crank rock-shaft capable of alternately rocking in opposite directions, the powermeans serving to rock it in one direction to make the case shift to the rip-position, means shaft, key-operated,

being provided for locking the parts in the up-position, and key-controlled devices for putting the power-means into action and also for releasing the lock-up means to permit a downshift to take place, said powerdriyen means embodying a pair of'toothed elements one afiiiced to the rock-shaft and the other to a reciprocating member in sai power-driven means. I

36. In a case-shift mechanism, a powerdriven shift-frame actuating mechanism, a key, means whereby upon depression and release of said key. said mechanism will always shift and hold the frame in upper case position, a second key, and means whereby said frame will be released, upon actuation of the second key following a case-shift "operation effected by actuation of the first by power other than that applied to the keys by the operator.

37. In a typewriting 'machine, powerdriven means for case-shifting, key-controlled devices for putting the power into action to thereby cause a caseshift action to take place through the medium of the power, and locking means, said key-controlled devices embodying a first key-lever having the function only of putting the power-devices into action and a second key-lever having the function not only of releasing the shifted mechanism when previously' actuated by said first lever but also of putting the powermeans into action, said shifting mechanism having a lost-motion connection between two of its elements to thereby permit an idle motion on the part of the shifting mechanism connected directly to the power when said second lever is operated merely for release purposes. v

38. In a typewriting machine, powerdriven means for case-shifting, key-controlled devices for putting the power into action to thereby cause a case-shift action to take place through the medium of the power, and locking means. said key-controlled devices embodying a first key-lever. having the function only of putting the power-devices into action and a second key-lever having the function not only of releasing the shifted mechanism when previously actuated by said first lever but also of putting the powen means into action, said shifting mechanism embodying a pin-and-slot lost-motion connection between two of its elements to thereby permit an idle motion on the part'of the shifting mechanism connected directly to the power when said second lever is operated merely for release purposes.

39. In a case shift mechanism, a shift frame, a frame-moving mechanism. arranged ting-the power into action to cause saill upto shift the frame to upper case-position and hold it there,. a source of power, a pair of keys each. operating when depressed to render said source of power effective to actuate thefrgune moving means to shift the frame to upper-case position, a second source of power, and means adapted to be put into action by onlyone of said keys for rendering said second source of power effective to actuate the frame-moving- 'n'icans to release the frame upon upward movement of the key following a depression thereof.

40. In a? typewriting' machine, a poweractuated case-shift mechanism en-ibodying a crank rock-shaft capable of alternately rock ing in opposite directions and means for applyingthe power thereto on the upshift, the mechanism being such that on said upshift the crank will pass slightly beyond center, means for stopping the crank in this position to thus hold the shift in the up osition' and ke -*controlled means for nitshift and also for turning the shaft back beyond center to thus release the parts and permit the down-shift to take place.

411111 a typewritingr machine, a poweractuated case-shift mechanism embodying a crank rock-shaft and means for applying the power theretoon the tip-shift, the mechanism being such that on said up-shift' the crank will pass slightly beyond center, means for stopping the-crank in this position to thus hold the shift in the -up-position, and key-controlled means for putting t 3 power into action to cause said lip-shift and also for turning the shaft back beyond center to thus release the parts and permit the downshift to take place, said,\key-controlled means embodying a key-lever spring-means for depressing its inner-end and a spring-actuated hook carried by said lever for-causing said beyond-center movement of the shaft.

42. In a key-controlled power-actuated case-shift mechanism wherein a shift frame is moved between lower-case and upper-case positions by force other than that applied to the shift-key by an operator, the combination of means whereby the, shifting power is automatically cut off andthe shift frame positively held against return movement in-. dependently ofthe shifting power and power applied to the key when power-shifted to upper-case position and is automatically released by power and restored to normal position when manual pressureon the shiftkey is relieved.

43. In a key-controlled power-actuated position. v I

45. In a inanually-controlled power-oper-,

case-shift. mechanism wherein .a shiftrframe is moved I between case-positions by force other than that applied to keys by an operator, the coinl ination 01 a shift-and,-lock up control key, a release-control key, means whereby the shift-frame is automatically restrained from returning" to normalfpo si' tion upon release of manual pressm-conthe shift-and-lo,ck-1ip control key, and means whereby the shift-frame will be released, upon manual actuation of the release-control key, by power other than that applied to said releaserontrol key by an operator,

and will return to normal position only upon release of inanu'al'pressure applied by an operator to said release-control key. y, 44. In a typewriti'ng' machine, the combination'of a platen, a platen-support shiftable 11p' \var( lly' from lo\ver- -ase position to an upper-easeposition, a source of power,"v

means for shiftinethe platen-support normally disconnected f mm. the source of power, a key for temporarily connecting the support-shifting-means with the source" of power, and means'for' maintaining said connection until thesu 'ip ort reaches its .uppercaseposition. and then breaking the connection irrespective of the position of the key, said support-shifting-means comprising parts shifta ble relatively to each other by the source of powerto positions in which. they are held by the weightof the support when the support reaches its upper-case ated case-shift mechanism, the combination of a shift frame, means distinct. from the" power which moves the shift-frame to upp.er-.

case position for holding the shift-frame against return movement when shifted to upper case position, and keyrcontrolled power means for effecting movement of the shift frame to upper-case position and for subsequently releasing said shift frame, said.

that applied to the last-mentioned key by an operator p This specification signed this August 27, All). 1917. i

MANSFIELD o. oieAwLE r. 

